The words indite, indict sound the same but have different meanings and spellings. Why do indite, indict sound the same even though they are completely different words?
The answer is simple: indite, indict are homophones of the English language.
To accuse of wrongdoing; charge: a book that indicts modern values.
Law To make a formal accusation or indictment against (a party) by the findings of a jury, especially a grand jury.
To write; compose.
To set down in writing.
Obsolete To dictate.
Definitions from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.
If they are spelled the same then they are also homographs (and homonyms); if they are spelled differently then they are also heterographs (literally "different writing").